JP3476773B2 - Measuring device and method for measuring gas filling in liquids, especially plastic materials - Google Patents

Abstract

This invention relates to a measuring apparatus for measuring the gas loading of a liquid, comprising a measuring device which substantially consists of a piston pump, by means of which a sample quantity of the liquid is subjected to a reduced pressure in a measuring cylinder chamber and the dissolved amount of gas is thereby desorbed and can be determined via the gas law by changing the conditions of pressure and/or temperature in the cylinder chamber. The measuring apparatus is of particularly compact construction and for this purpose is provided with a servomotor as an actuating drive for the piston pump, which servomotor not only enables the reduced pressure to be generated in the measuring chamber but also ensures the return of the measured test sample from the measuring cylinder chamber after the measuring operation. Preferably, the measuring apparatus is provided with an ultrasonic generator by means of which the test sample is acoustically irradiated and the time of desorption for expelling the gas is thus considerably shortened.

Description

Description: TECHNICAL FIELD The present invention relates to a gas in a liquid. filling Measurement equipment for measuring
I do. A liquid is a component of a synthetic substance, especially a liquid.
The one corresponding to the type described in the full text of claim 1.
U. The invention further relates to the use of the measuring device according to the invention.
Liquid gas filling It relates to a method for measuring the amount. (Prior art) In technology, especially in plastic process technology, liquid
Gas filling in the body, e.g. for producing foam
The air content of liquid plastic components can be measured
Often needed. This is usually a constant gas filling
Depending on the purpose of allowing continuous operation by quantity
Things. In liquids, especially liquid plastic components
Many measuring devices are known for measuring gas filling
(DE 37 20 904 A1, DE 3
336 037 A1, DE 31 32 597
C2, DE 3 8 30209 A1, DE 41
19966 A1, EP 0 125 541
A2). These known measuring devices are generally
A measuring cylinder equipped with a Measurement Pis
Tons sometimes come from systems that carry liquids containing gases.
Then, a predetermined amount of the sample is aspirated. This sample is measured
It is isolated and measured from the system in the service cylinder. This
This is generally done by adjusting the piston appropriately and measuring
Gas by increasing the volume of the
Sample containing dissolved and possibly free gas
To the reduced pressure in the closed measuring cylinder
Is achieved by subtracting Gas filling in liquid
Is measured by a known physical relationship (gas law).
From the change in the measured volume and the change in the pressure of the measurement sample
be able to. The measurement sample is measured using the measurement piston.
By compression and / or by decompression and subsequent compression
Measurement in the measuring cylinder
By measuring the pressure under test conditions, and
Simultaneously measure the volume of the measurement space with respect to the position of the stone.
With the above, the same result can be obtained. The measuring device of the preamble of claim 1 is disclosed in US-PS 4 37
6 172, whose measuring cylinder channel
The inlet is connected to the system via a filling valve on the inlet side.
Is bound to The system is designed for liquids containing gas under pressure.
It carries the body and has a storage container for liquids containing gas. Measurement
The chamber of the fixed cylinder has a discharge valve on the outlet side.
Connected to the return line via a switch. Return line
Is returning to the storage container. Again, the gas charge is
Withdraw a predetermined amount of sample from the system and measure it
To the measuring cylinder of the pump
With the valve and drain valve closed,
Perform sample measurements in isolation from the system
Is measured. The sample is isolated by moving the piston.
By adjusting the piston by controlling the movement,
First, reduce the pressure in the fixed cylinder, then pressurize
To do that. In the course of this process,
Of the measuring cylinder chamber resulting from the
The value of the measured pressure, as well as the change in volume,
Liquid gas filling volume processed by electronic evaluation unit
Is used to control to a predetermined constant value. Measurement
After the set operation has been performed, the filling and discharging valves are
The test sample is reopened and the test sample is
Therefore, it is returned to the storage container again. Done about sample
The measuring cylinder of the pump is
In addition, it is connected to the pumping system of the whole device. (Explanation of the present invention) The present invention is based on a known measuring device, and
Using the measuring pump according to the aforementioned U.S. Pat. No. 4,376,172.
It is derived from the device that was used. First object of the present invention
Is a piston that is used as a gas filling
Pumps without increasing production costs and
Liquid plastic structure for the production of
The gas filling of the components in various operating systems and
Accurate measuring system in various piston pump configurations
To provide a stem. The above object is achieved by a transmission gear and
Adjustment of a piston pump consisting of a controlled servomotor
By providing a drive and a piston pump
The system from the measuring cylinder chamber after the measurement has been performed.
It can also be configured as a supply pump to return test samples to the system.
Is achieved by This design of the measuring device also
Controlled servomotor and associated transmission
The suction gear allows the displacement of the pump piston to be
Very precise adjustment in any direction of compression
Measurement cylinder, which results in a measuring cylinder
It is possible to accurately measure the change in volume of the chamber,
Test volume from the change in volume
Sample gas content.
You. At the same time, the piston pump according to the invention does not
When the discharge valve is opened after the
Supply to extrude a pump cylinder test sample to be formed
It can be operated as a pump. Thus, the book
The piston pump according to the invention is a pumping system for the entire apparatus.
Placed in an independent circuit separated from the stem,
The cylinder chamber for measuring the pump
Can be isolated from systems that are under pressure
It is. In addition, from the closed position to the open position,
Conversely, valves that can be switched independently of each other,
Fill and discharge valves associated with the piston pump
Used. This opens the filling valve and discharge valve
To close the measurement cylinder chamber with the test sample.
By closing the filling valve and opening the discharge valve,
Discharging the test sample after the measurement operation has been performed
Can be. In another advantageous embodiment of the invention,
The measuring device associated with the stone pump is
Test sample pressure for different volumes of the Linden chamber
And temperature are both measured. this
Effect of temperature on desorption behavior of liquid
Measurement and evaluation, e.g. the gas filling of the liquid during operation
Can be constant. Transmission of piston pump according to the invention
For both the gear and the adjustment drive,
Can be used. Servo motor
In addition, a torque motor capable of reversing the rotation direction,
Uses an electric torque motor in the form of a stepper motor.
It can be used appropriately. Transmission gear
One effective embodiment is that the
Of the pump piston that can be displaced in the axial direction
There is a spindle gear to which the unit is connected. In the present invention
Pump piston is designed in a compact body
can do. This pump piston is
A cylinder body having a cylinder chamber. Cylinder body
Is provided as a foundation through a housing body.
Connected to the connector for mounting the servo motor.
You. The housing body is the transmission gear or
Housing a spindle gear, preferably cylindrical
You. Each part should be screwed or similar.
More detachable connection is possible. By flange
The above-mentioned connector to which a servomotor can be attached
Form a housing for accommodating the shaft coupling device
Can be The shaft coupling device drives the servo motor
Coupled to the transmission gear or spindle gear. [0010] A very advantageous embodiment of the invention is described in the claims.
Meaning worthy of independent protection in combination with the preamble of clause 1
With a sense of meaning, in the measuring cylinder chamber of the measuring device.
Can be obtained by being able to associate an ultrasonic generator
You. With this ultrasonic generator, the pump piston creates pressure
Move in the measurement space to reduce
While being maintained in the measurement cylinder chamber.
Generates ultrasonic vibrations in a contained liquid sample
be able to. As a result of this ultrasonic vibration,
Gas that has been exhausted much faster than is possible with decompression alone.
I can get out. Required to make accurate measurements on samples
The combination of the reduced pressure generator and the ultrasonic generator
Thus, it can be considerably shortened. Generate ultrasonic waves in the sample
The sample into the measuring cylinder
The time until a valid measurement is made
Is needed to make reliable measurements without ultrasound
Can be reduced to one-fourth of the required time.
Thus, the method according to the invention provides an accurate gas filling
Not only enables measurement, but also makes this measurement very fast
To be able to do. On the radial side of the measuring cylinder chamber,
The inlet and outlet for filling and emptying the measuring cylinder chamber
Is provided. The ultrasonic generator is located in the measuring cylinder chamber.
It can be arranged at one end in the axial direction. As a result,
Compact configuration and access to the ultrasonic generator.
Also becomes easier. The ultrasonic generator is located in the measuring cylinder chamber.
It is preferable to be detachably housed in the opening inside. Measurement
Avoid direct contact between the moving liquid and the ultrasonic measuring instrument
For this purpose, it is appropriate that the opening is closed with a thin film. I
But in this situation, generated by the ultrasonic generator
Ultrasonic waves are applied to the liquid without being disturbed by the thin film
It must be guaranteed to be transmitted. Especially effective
Solution is to house the ultrasonic generator in the holding flange
And fix it there with fixing screws.
So that they can be easily replaced when needed
It is to be. Instead of an ultrasonic generator, different types of
It is also possible to provide a vibration generator. For example, times
Lower frequency of piston pump, such as eccentric
Some generate vibration. These vibrations are
Transmitted during pull to expel gas from liquid more quickly
You. [0013] The measuring cylinder chamber is provided with a pressure and / or temperature.
At least one connection opening for the sensor
It can be provided on the cylinder wall or cylinder body. This
Sensors measure pressure and temperature during initial measurement
can do. Closes in the measuring cylinder chamber
Syringe opening for inspection and / or service
It can be provided on the wall. This is through the sight glass
To be able to look inside the measurement cylinder chamber.
Cleaning without having to completely dismantle the entire unit.
In order to make it work. The measuring device according to the present invention is a system,
Effective use in plastic processing systems
Can be. Where the measuring cylinder of the piston pump
The chamber is, on the inlet side, as far as possible via a filling valve.
More directly, in each case by the shortest possible conduit.
Containing a liquid filled with gas at an initial pressure,
Connected to the vessel with the feeder, the piston pump
The measuring cylinder chamber of
And it is connected to the return pipe to the storage container. sample
The circuit for the measurement of
Shut off gas-filled liquid from supplied system
Can be This allows the system pressure to
Ton does not fall on the inside of the pump. In addition, the technical field
As is known in
Control device is provided. This evaluation and control device is
They are connected by electrical signals and control lines. Measurement
The instrument measures the pressure and temperature of the test sample.
Connected to the adjustment drive and suitable for the gas supply valve.
It is connected right. The gas supply valve is connected to the storage container.
It is located on a rigid gas supply pipe. For gas supply valve
The gas filling amount of the liquid in the storage container is
It is adjusted to. (Preferred Embodiment of the Present Invention) For the purpose of understanding the present invention, a prior art sentence cited in the introduction.
It is believed that they form part of the description of the present invention.
Refer to its disclosure. The operation shown as a flow chart in FIG.
The pointing system is the configuration of the entire apparatus. The whole device
Is suitable for plastic processing, especially polyurethane
Can be used for the production of foamed plastic. this
The system has a storage container 1. The storage container 1
Liquid filled with gas (plastic component)
To accommodate. The gas-filled liquid passes through conduit 2
Is supplied to the storage container at a predetermined initial pressure.
Held in it under As known in the art
In addition, in the storage container 1, there is a stirrer driven by a motor.
There is a stirrer 3. An annular distributor 4 is provided below the stirrer 3.
You. Gas, for example air, is introduced into the storage container via the distributor 4.
And at least the majority is absorbed by the liquid
As such, it is finely distributed among the liquids therein. Distributor 4
Supplies the gas filling the liquid via conduit 5
Connected to a suitable gas source. The conduit 5 contains gas
Supply valve 6 followed by a flow control valve 7 and a check
A valve 8 is arranged. The gas supply valve 6 is a solenoid valve.
Central electronic type via electronic control line 9
Control and open conduit by the evaluation and control unit 10
5 to the distributor 4 so that the liquid in the storage container 1
Can be introduced. The storage container 1 has a discharge pipe at its bottom.
11 is connected. The discharge pipe 11 is
Connected to a mixer head (not shown)
ing. In the mixer head, the reaction for whipping
Before mixing takes place, the gas from storage container 1 is filled.
Component is mixed with the second plastic component
You. The gas filling amount of the liquid in the storage container 1 is determined in advance.
Adjust to the specified target value and maintain it at this target value
Measurement device for measuring the gas filling of the liquid.
Equipment is provided. This measuring device is used as a measuring instrument
It has a stone pump 13. Measuring device pump series
Is a liquid filled with the gas taken out of the storage container 1.
A measuring cylinder chamber 14 for receiving a body sample is provided.
You. Here, the measuring cylinder chamber 14 is connected via a supply pipe 15.
The storage container 1, in the embodiment shown, is connected to the discharge pipe 11,
It is connected upstream of the valve 12. Supply pipe 15
Is provided with a filling valve 16. The supply pipe 15 is a valve
16 as short as possible. this is,
The sample to be measured is pulled from the container 1 in a fresh state,
In order not to stay in the tube 15 for a long time before
It is. Measurement cylinder chamber 1 of piston pump 13
4 is connected to the storage container 1 via the return pipe 17
I have. The return pipe 17 is provided with a discharge valve 18. Show
In the embodiment described, the return pipe is connected to the retrograde section 19.
Is flowing. The retrograde section 19 is the same as the mixer head described above.
To the storage container 1 for excess liquid without any mixture
Form a continuation. The piston pump 13 is connected to a conduit 15 and
And 17 are arranged in a circuit. this
The circuit includes a storage container 1 therein. Also, this circuit
When the shut-off valve 12 is closed, the system pressure of the device
Shielded from power. Instead of conduits 11 and 19, a circuit
Are connected directly to the storage container 1
Other configurations are of course possible. Again, the system
A circuit is formed for the measurement sample that is independent of pressure
You. As shown in FIG. 1, the piston pump 1
The measuring device 20 is installed in the measuring cylinder chamber 14 of No. 3.
Have been. This measuring device is located in the measuring cylinder chamber 14.
To a sample filled with gas that exists as a test sample
If the piston pump is in a different piston position
Different pressures are measured. Also preferably, during the measurement
Also measure the temperature of the test sample. Measured pressure and
And temperature for evaluation via the electrical signal line 21
Is supplied to the evaluation and control unit 10. electoronic signals
The line 21 is an adjusting drive 22 for the piston pump 13
It is also used to control The gas filling amount of the liquid disposed in the storage container 1 is
To measure, shut off valve via conduits 11 and 15
Withdraw the liquid from the bottom of the container above 12 and open
For measuring the piston pump 13 via the filling valve 16
It is introduced into the cylinder chamber 14. In this step, the measurement
The pump piston 23 forming the ston is used in the suction step,
In the illustrated embodiment, the ascent step is performed and the measuring
The volume of the chamber 14 increases correspondingly. Fixie
Pump 23 is the first end in the measuring cylinder chamber 14
As soon as the position is reached (in this position the measuring cylinder chamber
Contains the desired amount of sample)
Valve 16 is closed and exhaust valve 18 is closed at the same time
The sample pulled into the measuring cylinder chamber 14 is
To perform the measurement,
Or isolated. Subsequently, the gas filling amount of the sample is measured.
You. For this purpose, the pump piston 23 is stationary
Measurement with valves 16 and 18 closed
Immediately after being introduced into the chamber 14, the pressure and temperature of the test sample
The degree is measured by the measuring device 20. Measured in this way
The measured values obtained are evaluated and controlled via signal line 21.
It is supplied to the knit 10. Then the pump piston 23
Along the reverse stroke direction (suction direction)
Moved and held there. As a result, the measurement
The test sample contained in the chamber 14 is a gas sample.
Is placed under reduced pressure to separate the liquid. That is,
Gas is forcibly desorbed from the liquid of the test sample. So
After that, the pump biston 23 moves for a predetermined distance
Will be returned. In other words, the direction of compression, in other words, the measurement system
It is moved in a direction to reduce the volume of the cylinder chamber 14. this
Is, for example, a predetermined reference pressure (test pressure),
For example, so that atmospheric pressure is obtained in the test sample
You. This means that the pressure and temperature are
Confirmed by measuring Measurement of measuring device 20
The signal is likewise evaluated and controlled via signal line 21
It is supplied to the unit 10. Gas law (p × V = m × R
× T), the evaluation and control unit 10
From the pressure and temperature measurements given to the piston and
The travel distance of the pump (from now on,
Changes in volume are required).
And the amount of gas contained can be calculated. this
If the gas amount is different from the predetermined target value,
Supply or withdraw gas via the evaluation and control unit 10
Gas supply valve by leaving and controlled thereby
6, the gas amount in the liquid in the storage container 1 is set to the target value.
Can be adjusted. After the measurement operation is performed,
The pump piston 23 is compressed by the adjusting drive device 23.
Driven in the direction (here, downward), and the measuring cylinder chamber 1
4 is now open drain valve 18
And it is returned to the storage container 1 via the return pipe 17. This
As described above, the measurement of the gas filling amount of the liquid is performed by a circulation operation.
The measuring operation is performed in the measuring cylinder chamber 1 of the piston pump 13.
The test sample drawn from the storage container 1 in 4 is predetermined.
To the same state (gas filling amount) as the set target value.
Is performed continuously. The piston will now be described with reference to FIGS.
The structure of the pump 13 will be described in more detail. As shown in Figure 2-4
The embodiment of the piston pump 13 is a metal blower.
Having a cylinder body 24 made of
24 is a measuring cylinder chamber 14 having a cylinder bore.
Having. A piston seal is provided in the cylinder body.
The pump piston 23 is guided. Measurement series
The supply chamber 15 has a supply pipe 15 (FIG. 1) and a charge at one end.
An inlet 25 for the sample supplied via the filling valve 16
I do. In addition, the measurement cylinder chamber 14 extends in the
It has an outlet 26. The outlet 26 is connected to a drain disposed here.
To connect to return pipe 17 connected to outlet valve 18
belongs to. The cylinder body 24 is opposite the inlet 25
At the end of the pair, a cylindrical housing body 27
Is stuck. The housing body 27 is
Housing transmission gears in the form of gears
You. The transmission gear is connected to the piston 23.
Have been. The housing body 27 is located at the other end.
And a flange plate 28 which can be screw-connected.
Thus, it is detachably connected to the connection body 29. Contact
At the free end of the connector 29, the servo
The table 30 is detachably attached. Adjustment drive
The motor shaft 31 is connected to a shaft joint inside the connecting body 29.
The transmission gear is transmitted by the transmission through the hand 32.
A, that is, movably coupled to its displacement spindle 33
Have been. Here, the shaft coupling 32 is
It is a shaft coupling. The displacement spindle 33 is a bearing
In the bush 35, the rolling bearing 34
It is rotatably attached to the connection body 39. bearing
The bush 35 is fixed by the flange plate 28.
And a cylindrical housing body 27 at one end.
Are screwed together. Servo motor reverses rotation direction
Electric stepping motors that can be
And the displacement spindle 33 is driven bidirectionally to rotate
The piston 23 can be moved in both directions.
Displacement spindle 33 inside housing body 27
A spindle nut 36 is disposed on the male screw of the.
The pump piston 23 is powered by the spindle nut 36.
Communicatively coupled. As shown in FIG.
Has a piston shaft 37 of reduced diameter
I have. A slide bearing 38 is provided on the piston shaft 37.
The cylindrical housing body 27
Are guided in such a way that they can be displaced in the axial direction. Pis
Ton shaft is connected with hollow piston attachment 39
Have been. Attachment 39 is also housing body 2
7 is guided axially. Attachment
The end of the displacement spindle 33 on the piston side is inserted into
Has been entered. The spindle nut 36 is a hollow piston
It is located in the attachment 39,
It is connected to the statement 39. Hollow piston attachment
To the pin from the pin 41 protruding in the radial direction.
The rotation direction fixing member is fixed. Fixed rotation direction
Parts can be threaded studs
It is. The rotation direction fixing member is provided to be elongated in the axial direction.
Through the opening 42 to the housing body 27,
When the position spindle is driven, the pump piston 23
And the spindle nut 36 attached thereto is
Locked in the rotational direction, the spindle nut 36
Pulling the pump piston together with the pump piston 23
And the stroke of the axial stroke
Do just that. The piston pump 13 illustrated in FIG.
Detects the piston in both directions of its stroke
It also has a sensor to perform. The sensor is a proximity sensor
43 and 44. The proximity sensors 43 and 44
The adjustment driving device, that is, the switch of the servomotor 30 is
Switch is turned on or off, and the rotation direction is reversed.
Can be done. The proximity switch has an elongated opening 42.
In the end region of the housing body 27 from one another
Are spaced apart in the direction
Can be opened. During the step of aspirating the test sample,
During the measurement in the measuring cylinder chamber 14 and the measuring operation
While the test sample is ejected after the
The switches 43 and 44 are connected to the pump
Limit the stroke movement of the ston. Measuring cylinder
Such a stoke motion measurement for the measuring piston
The device can be used in various types of measuring devices for liquid gas filling.
Is known for its state. Therefore, no explanation for this is given.
It is for. FIG. 5 shows a cross section of the lower end. Figure
5 is a particularly preferred measurement of the second embodiment according to the present invention.
1 includes a cylinder chamber 14. Not shown that
The upper region corresponds to the upper region of the configuration shown in FIG.
You. Therefore, a detailed description of the upper region will be omitted. In the second embodiment shown in FIG.
Both the inlet 25 and outlet 26 for the liquid sample are in the cylinder chamber 14
Configured as a radially oriented connection to
The sample is guided to the measurement cylinder chamber 14 through these
And discharged again after the measurement has been made. Measurement
An axial (lower) end 50 of the cylinder chamber 14 is provided with a cylinder.
In the body 24, an axial bore having an internal thread 52 is provided.
A 51 is provided. In the bore 51, a holding
The flange 53 is screwed. Holding flange 53
Has a central bore. The central bore is measured with bore 51
A passage 54 to the constant chamber 14 is formed. Passageway 54 is
Pump piston 1 at the bottom of fixed cylinder chamber 14
3 closed by a thin film 55 at the tip facing
It may be that it is. The holding flange 53 is provided with an ultrasonic generator 56.
I support. The ultrasonic generator 56 is fixed here.
It is screwed to the flange by a tool screw 57. Super
The sonic generator is a commercially available part and has a cylindrical shape
The ultrasonic transmitter 58 is facing the pump piston
At its tip. The ultrasonic transmitter 58 has an end face 59
Inserted into the axial passage 54 in contact with the thin film 55
Have been. Measurement cylinder chamber using ultrasonic generator
Irradiates the liquid sample contained in 14 with ultrasonic waves
be able to. Here, the desorption process, that is, the liquid and
The separation from the gas dissolved in
This can be considerably accelerated as compared with the embodiment. Ultrasonic emission
Ultrasound introduced into liquid from creature 58 through thin film 55
Is only the decompression generated by the movement of the piston
Eliminate gas more quickly. Get accurate test results
To apply low pressure to liquid samples for desorption
The time required depends on the simultaneous application of ultrasound to the sample.
In that case, it could be reduced by 50% or more. Reduction of measurement time
Shrinkage is particularly advantageous. Because the test sump
When it is very close to the time when the
This is because a test result can be obtained. Try a sample
The shorter the interval between when the test was
Target gas contained in liquids more quickly and accurately
It is possible to control the value. An embodiment of the piston pump shown in FIG.
At the inlet 25 of the cylinder body 24,
Opening 50 for the pressure and pressure sensor 20 can be seen.
You. The opening 50 is also arranged in the cylinder body 24
Radial to the inspection and service opening 61
Are arranged. During operation, this inspection and services
The opening is closed airtight by a screw-in eyepiece 62
You. Measurement of the liquid to be measured in the measuring cylinder chamber 14
The behavior inside is the viewing glass 63 screwed into the eyepiece.
Can be observed through. For example, for cleaning
Open the eyepiece 62 for service purposes
Remove from 61 and connect hoses for flowing liquid etc.
You can continue. The piston substantially as described with reference to FIGS.
The measuring device consisting of a ton pump is very compact
, Which is constructed as a spindle gear
The transmission gear forms a measuring piston.
Stroke movement of the pump piston 23
Can also be done very accurately. In this device,
Sample gas isolated in the cylinder chamber 14
It is possible to measure the filling volume very accurately. test
The measurement of the sample is performed by the piston
For two or more different positions
You. The pressurized and reduced pressure applied to the test sample is
Measurement of physical quantities and pressure and temperature measured at that time
Constant value, plus body due to stroke movement of pump piston
The product change allows liquids of all viscosities to be
Measurement of gas that is dissolved in the body and exists freely
It can be done effectively. The measured values obtained are
As illustrated in the apparatus shown in FIG.
Can be used to adjust. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows the entire apparatus according to the present invention,
Piston used to measure and shown schematically
Shown with pump. FIG. 2 shows a first embodiment of the piston pump shown in FIG. 1;
FIG. 3 is a sectional view taken along line III-III in FIG. 2; 4 is a cross-sectional view taken along line IV-IV of FIG. 2; FIG. 5 shows a second preferred embodiment of the piston pump;
are doing. This figure corresponds to FIG.
Only one is shown enlarged.

Continuation of the front page (72) Inventor Hausbichler, Hannes Aer-6900 Bregenz Rathausstrasse, Austria 37 (56) References JP-A-6-63992 (JP, A) Japanese Utility Model Application Showa 60-183852 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01N 7/14 B29C 44/00 G01N 33/44

Claims (1)

(57) A pump arranged in a circuit for a sample and having a pump piston that can be moved in both stroke directions in a measurement cylinder chamber by an adjustment drive device; A switchable valve device consisting of a filling valve for filling the sample to be measured into the measuring cylinder chamber and a discharge valve for discharging the sample from the measuring cylinder chamber after the measuring operation is performed; A pressure measuring device capable of measuring the pressure of the sample isolated in the measuring cylinder chamber by closing the valve device at a predetermined position of the pump piston in order to measure the gas filling amount. The adjusting drive (22) of the piston pump (13) is composed of a transmission gear and a servomotor (30). The ston pump also constitutes a feed pump that returns the sample from the measuring cylinder chamber (14) to the system after the measuring operation has been performed, and the ultrasonic generator associated with the measuring cylinder chamber (14).
A measuring device for measuring a gas filling amount of a liquid plastic component, comprising a vessel (56) .